EP1687531A1 - System for manipulation of a body of fluid - Google Patents
System for manipulation of a body of fluidInfo
- Publication number
- EP1687531A1 EP1687531A1 EP04799095A EP04799095A EP1687531A1 EP 1687531 A1 EP1687531 A1 EP 1687531A1 EP 04799095 A EP04799095 A EP 04799095A EP 04799095 A EP04799095 A EP 04799095A EP 1687531 A1 EP1687531 A1 EP 1687531A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fluid
- counter electrode
- control electrodes
- manipulation
- droplet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 108
- 238000010292 electrical insulation Methods 0.000 claims description 24
- 230000002209 hydrophobic effect Effects 0.000 claims description 24
- 238000000576 coating method Methods 0.000 claims description 19
- 239000011248 coating agent Substances 0.000 claims description 18
- 230000005661 hydrophobic surface Effects 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 239000010410 layer Substances 0.000 description 15
- 239000000463 material Substances 0.000 description 5
- 239000002356 single layer Substances 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- XPBBUZJBQWWFFJ-UHFFFAOYSA-N fluorosilane Chemical compound [SiH3]F XPBBUZJBQWWFFJ-UHFFFAOYSA-N 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 229920000052 poly(p-xylylene) Polymers 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000003851 biochemical process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B19/00—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00
- F04B19/006—Micropumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
- B01L3/5027—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip
- B01L3/502769—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip characterised by multiphase flow arrangements
- B01L3/502784—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip characterised by multiphase flow arrangements specially adapted for droplet or plug flow, e.g. digital microfluidics
- B01L3/502792—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip characterised by multiphase flow arrangements specially adapted for droplet or plug flow, e.g. digital microfluidics for moving individual droplets on a plate, e.g. by locally altering surface tension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B17/00—Methods preventing fouling
- B08B17/02—Preventing deposition of fouling or of dust
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/08—Geometry, shape and general structure
- B01L2300/089—Virtual walls for guiding liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/16—Surface properties and coatings
- B01L2300/161—Control and use of surface tension forces, e.g. hydrophobic, hydrophilic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2400/00—Moving or stopping fluids
- B01L2400/04—Moving fluids with specific forces or mechanical means
- B01L2400/0403—Moving fluids with specific forces or mechanical means specific forces
- B01L2400/0415—Moving fluids with specific forces or mechanical means specific forces electrical forces, e.g. electrokinetic
- B01L2400/0421—Moving fluids with specific forces or mechanical means specific forces electrical forces, e.g. electrokinetic electrophoretic flow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2400/00—Moving or stopping fluids
- B01L2400/04—Moving fluids with specific forces or mechanical means
- B01L2400/0493—Specific techniques used
- B01L2400/0496—Travelling waves, e.g. in combination with electrical or acoustic forces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2002/14395—Electrowetting
Definitions
- the invention pertains to a system for manipulation of a body of fluid, in particular a fluid droplet.
- the known system for manipulation of a fluid droplet concerns a micro-fluidic chip having reservoirs in fluid connection by one or more microchannels.
- Integrated electrodes are provided that function as control electrodes. Each of these integrated electrodes is positioned in one of the reservoirs such that the electrodes electrically contacts a material or medium contained in the reservoir.
- a voltage controller is provided to which the integrated electrodes are connected. By applying electrical voltages to the integrated electrodes, samples of the material or medium are electrokinetically driven though the microchannels to carry out biochemical processes.
- An object of the invention is to provide a system for manipulation of a fluid droplet in which the control over and reliability of the manipulation of the fluid droplet is improved.
- This object is achieved by a system for manipulation of a fluid droplet according to the invention comprising several control electrodes to which an adjustable voltage is applied, - a counter electrode having a fixed voltage and - being provided between the fluid droplet and one of the control electrodes, - covering a part of the surface of the respective control electrodes, in particular the ratio of the width of the counter electrode to the width of the control electrodes being in the range from 10 "5 to 0.9.
- the fluid body for example in the form of a fluid droplet comprises a polar and/or electrically conducting first fluid material .
- the fluid body is adjacent to a solid wall .
- the rest of the droplet is surrounded by at least one second fluid , which may be a liquid, a gas or a vapour with a lower polarity and/or lower electrical conductivity than the first fluid of the fluid body.
- the droplet and the fluid or fluids that surround the droplet should be immiscible, i.e. they should tend to separate into separate bodies of fluid.
- the counter electrodes and the counter electrodes are provided at the side of the fluid droplet facing the solid wall. Usually, these electrodes are part of the solid wall. Because the fluid droplet is in electrical contact with the counter electrode at a fixed voltage, the fluid droplet is maintained accurately at the same fixed voltage.
- the counter electrode is kept at fixed ground potential, so that the fluid droplet is maintained at ground potential.
- a control electrode adjacent to the actual position of the fluid droplet is activated, the fluid droplet is moved from one control electrode to the next under the influence of the electrowetting effect.
- the electrowetting activation causing movement of the fluid droplet is made more efficient.
- the potential differences that drive the displacement of the fluid droplet are more accurately controlled. It is avoided that inadvertently the fluid droplet attains the potential of any one of the control electrodes that makes unintentional relatively close electrical contact with other structures of the system for manipulation of a fluid droplet. Also it is avoided that the fluid droplet has a floating potential.
- the fluid droplet is freely accessible at its side remote from the counter electrode and the control electrodes.
- the fluid droplet can be employed as an object carrier and a pay-load can be placed on the droplet from the freely accessible side.
- the pay-load can be unloaded from the fluid droplet at the freely accessible side of the fluid droplet.
- An electrical insulation is provided between the counter electrode and the respective control electrodes. Hence, the potential difference between the counter electrode and any activated control electrode(s) can be accurately maintained.
- the fluid droplet is more strongly electrically insulated from the control electrodes than from the counter electrodes, so that the electrical potential of the fluid droplet is very close to the electrical potential of the counter electrode and a substantial potential difference between the fluid droplet and any of the control electrodes can be maintained.
- the thickness of the electrical insulation over the control electrodes is much larger than the thickness of the electrical insulation over the counter electrode, the fluid body will attain approximately the electrical potential of the counter electrode.
- the potential difference between the fluid droplet and the activated control electrodes is accurately maintained so as to accurately control displacement of the fluid droplet as driven by these potential differences.
- the electrical insulation has a hydrophobic surface towards the fluid droplet, for example a fluid contact coating is disposed over the electrical insulation.
- the fluid contact coating has low-hysteresis for advancing and receding motion of the fluid body. Good results are achieved when a hydrophobic coating is employed as the fluid contact coating.
- the hydrophobic coating is disposed as hydrophobic monolayer, such as a fluorosilane monolayer.
- the electrical insulation of such a hydrophobic monolayer allows the electrical potential of the fluid droplet to closely approximate the electrical potential of the counter electrode.
- the fluid droplet is in contact with the hydrophobic surface of the electrical insulation which supports unrestricted movement of the fluid droplet from one control electrode to the next.
- hydrophobic indicates here that the interfacial energies 7 - related to the solid wall , the first fluid of the fluid droplet and the surrounding second fluid, denoted respectively by the subscripts S, FI, and F2, meet the condition:
- the fluid droplet makes an interior equilibrium contact angle with the hydrophobic surface that is more than 45°; very good results are achieved when the contact angle is in the range from 70° to 110°.
- the counter electrode has a hydrophobic surface, for example a hydrophobic coating is disposed on the counter electrode on its side facing away from the control electrode.
- the adhesion between the counter electrode and the fluid droplet is reduced, or in other words the contact angle between the fluid droplet and the counter electrode is relatively large, for example in the range from 70° to 110° .
- the counter electrode has a hydrophobic surface it is avoided that the fluid droplet sticks to the counter electrode and displacement of the fluid droplet is made easier.
- the counter electrode with the hydrophobic surface is employed it has appeared that it is not necessary that the electrical insulation has a hydrophobic surface. In all cases it is important that the difference between the advancing contact angle of the liquid droplet and its receding contact angle allows a sufficient electrowetting effect to switch between holding the fluid body in place and displacing it.
- contact angle hysteresis can prevent the droplet from moving under the electrowetting effect, in the way that it causes the fluid droplet to stick to the surface more after it has made the first contact.
- well controlled displacement of the fluid body is achieved when the difference or hysteresis between the advancing and receding contact angle does not exceed 20°.
- the measures of hydrophobic surfaces or hydrophobic coatings on the counter electrode and/or the electrical insulation, respectively are particularly advantageous when the control electrodes are arranged in a two-dimensional pattern so that essentially unrestricted displacement in two-dimensions of the fluid droplet is made possible.
- Figure 1 shows a schematic cross section of an embodiment of the system for manipulation of a fluid droplet
- Figure 2 shows a schematic top view of the embodiment of the system for manipulation of a fluid droplet of Figure 1
- Figure 3 shows a schematic cross section of an embodiment of the system for manipulation of a fluid droplet
- Figure 4 shows a schematic cross section of an alternative embodiment of the system for manipulation of a fluid droplet.
- Figure 1 shows a schematic cross section of an embodiment of the system for manipulation of a fluid droplet.
- Figure 1 shows a cross section along the plane A-A, indicated in Figures 2 and 3, transverse to the surface of the substrate 40.
- the control electrodes 33,34 are disposed on a substrate 40 .
- the counter electrode 31 is shown on a substrate 40 .
- an electrical insulator 32 which is formed as an electrical insulation layer, for example parylene-N.
- the hydrophobic coating 41 is disposed, for example the amorphous fluorpolymer AF-1600, provided by Dupont.
- the electrical insulation layer is formed of a hydrophobic insulator such as AF-1600.
- the counter electrode may be coated with a monolayer of hydrophobic material, for example a fluorosilane.
- An electrical control system is electrically connected to the control electrodes.
- the electrical control system includes a voltage source 36 and a set of switches 35.
- the switches are operated in a controlled fashion so as to successive activate adjacent control electrodes. Any switching mechanism can be employed; very suitable switches are for example thin-film transistors or optocouplers.
- Figure 1 the situation is shown where the control electrode 33 is being activated.
- the fluid droplet 37 that is currently positioned at control electrode 34 will then be displaced, as shown in dashed lines, to the adjacent control electrode 33 under the influence of the electrowetting effect.
- the contact angles of the displacing droplet 38 at its advancing side (to the right in the Figure) is smaller than the contract angle at its receding side(to the left in the Figure). This electrical voltage influences the interaction between the carrying fluid droplet and the surface of the substrate.
- the cosine of the contact angle of the fluid droplet and stack of layers on the substrate 40 decreases approximately with the square of the modulus of the electrical potential of the stack relative to the fluid. That is, the stack is effectively made more hydrophilic in the region of the electrodes when an electrical voltage is applied.
- This phenomenon is often termed 'electrowetting' and is discussed in more detail in the paper 'Reversible electrowetting and trapping of charge: Model and Experiments ', by H.J.J. Verheijen and M.W.J. Prins in Langmuir 19(1999)6616-6620.
- Figure 2 shows a schematic top view of the embodiment of the system for manipulation of a fluid droplet of Figure 1.
- FIG. 2 shows that the counter electrode 31 is narrower than the control electrodes 33,34.
- the ratio of the width of the counter electrode to the width of the control electrodes can be in the range from 10 "5 to 0.9; good results are especially obtained in the narrower range from 10 "3 to 0.2. It is also important that the counter electrode not be wider than typically half the so-called capillary l c
- FIG. 3 shows a schematic cross section of an embodiment of the system for manipulation of a fluid droplet.
- Figure 3 shows a cross section along the plane B-B transverse to the surface of the substrate 40. From Figure 3 it is clear that the counter electrode 31 is narrower than the control electrodes 33,34 and the fluid droplet extends over the control electrodes.
- the hydrophobic coating 41 is applied.
- the electrical insulation layer may be formed of a hydrophobic material so that the electrical insulation layer 32 and the hydrophobic layer 41 are formed as a single hydrophobic electrical insulation layer.
- Figure 4 shows a schematic cross section of an alternative embodiment of the system for manipulation of a fluid droplet. In the embodiment shown in Figure 4 the hydrophobic coating 41 covers both the electrical insulation layer 32 and the counter electrode 31. The hydrophobic coating 41 is much thinner over the counter electrode than over the electrical insulation layer 32.
- the thickness of the hydrophobic coating may range from a monolayer of one to a few ran to a coating of a few hundred nm (e.g. 200-700nm)
- the small thickness of the hydrophobic coating 41 over the counter electrode 31 achieves capacitive coupling of the fluid droplet 37 and the counter electrode.
- the electrical insulation layer does not need to be hydrophobic itself and is for example made of parylene-N.
- the counter electrode is thin, it may be deposited on top of layer 41 after which the whole surface consisting of insulator 32 partly covered with electrode 31 is entirely covered with a hydrophobic layer of uniform thickness. This offers advantages regarding ease of construction.
- the counter electrode may for example be a 10 nm thin metal layer, applied by evaporation through a shadow mask.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04799095A EP1687531B1 (en) | 2003-11-17 | 2004-11-09 | System for manipulation of a body of fluid |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03104229 | 2003-11-17 | ||
EP04799095A EP1687531B1 (en) | 2003-11-17 | 2004-11-09 | System for manipulation of a body of fluid |
PCT/IB2004/052355 WO2005047696A1 (en) | 2003-11-17 | 2004-11-09 | System for manipulation of a body of fluid |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1687531A1 true EP1687531A1 (en) | 2006-08-09 |
EP1687531B1 EP1687531B1 (en) | 2009-06-17 |
Family
ID=34585907
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04799095A Active EP1687531B1 (en) | 2003-11-17 | 2004-11-09 | System for manipulation of a body of fluid |
Country Status (7)
Country | Link |
---|---|
US (1) | US7328979B2 (en) |
EP (1) | EP1687531B1 (en) |
JP (1) | JP4773360B2 (en) |
CN (1) | CN100478075C (en) |
AT (1) | ATE434131T1 (en) |
DE (1) | DE602004021624D1 (en) |
WO (1) | WO2005047696A1 (en) |
Families Citing this family (118)
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